Debited more than I should've been!!

I've been trying to get a hold of Telkom for some time now and this is completely unacceptable!!<br> <br> I was debited last month, but the debit failed and I received an SMS later that day. That evening, I made a manual EFT payment via the bank in order to pay the debit amount that failed. The value and everything stated in the mail.<br> <br> Lo and behold, again!! ****ing Telkom decides to add an additional amount of fees to the debit and now it's almost double what it usually is. Please take ****ing note that the payment was in Telkom's account 2 days later and that explains the interest on the debit form